Q: Windshield wipers stopping in upright position.

I recently had the wiper arm nut come loose on my Ford truck - in the middle of a blizzard! Needless to say, that was not the way I wanted to spend Thanksgiving. Anyhow, you can loosen the nut to remove the wiper arm. However, your problem most likely lies in the park mechanism inside the wiper motor, the park circuit or the intermittent wiper unit. A qualified technician, like one from YourMechanic, can troubleshoot and repair your wipers.